2.The world's first-known man to give birth: Thomas Beatie.

Thomas Beatie has three children and is an advocate for transgender fertility and reproductive rights. In 2008, Beatie was the first male to successfully give birth. Beatie was born a female and began his transition at age 23. Thomas decided, however, to keep his reproductive organs. Now, many more men across the globe are giving birth every year, including 54 men recently in Australia alone.

3.Most children to survive a single birth: eight.

4.The most breast milk donated by a mother: 87 gallons.

CBS

In 2012, the New York Daily News reported that when Texas mom, Alicia Richman, found out she had much more breast milk than she needed, she donated nearly 87 gallons of it to the Mothers' Milk Bank of North Texas.

5.The world's longest known pregnancy: 375 days.

Vasyl Dolmatov / Getty Images

IIn 1945, Beulah Hunter had a pregnancy that lasted 375 days, nearly 100 days longer than the average gestational period. According to Time Magazine, Hunter’s doctor, Dr. Daniel Beltz, swore it was true, and — though there are some skeptics to this claim — the date of Hunter’s last period and first positive laboratory pregnancy test seem to corroborate it. One possible explanation: the baby was said to have developed more slowly than a typical baby.

6.Greatest number of children by one mother: 69 kids.

BuzzFeed

According to the Guinness Book of World Records, in the mid 18th century, the wife of Feodor Vasillyev gave birth to 69 children. She had 16 pairs of twins, seven sets of triplets, and four sets of quadruplets.

7.Oldest first-time mother: 70 years.

In 2008, Rajo Devi Lohan gave birth to her first child at age 70. Along with her husband, Baba Ram, the couple said they waited over 40 years to have a child. Their daughter, Naveen Lohan, was born through IVF.

8.First test tube mother: Lesley Brown.

Lesley Brown of Great Britain gave birth to the first successful test tube baby – Louise Joy Brown in July of 1978. The embryo was implanted in Lesley in November of 1977. Since then, the process now know as in vitro fertilization has helped millions of parents who struggle with fertility have children.

9.Longest time gap between the birth of twins in the womb: four months.

Twins Amy and Katie Jones-Elliot were born nearly four months apart in 2012. According to the Daily Mail, Maria Jones–Elliott's contractions stopped after she gave birth to Amy in June of 2012. Since Amy was born so prematurely, doctors determined it was safer to keep Katie in the womb longer. She was born four months later in August.